Preparation Method of Tungsten Disulfide by Electrochemical Stripping

Hydrogen reacts with oxygen to form water, which does not pollute the environment. It is a clean energy and can also be used in chemical production processes such as ammonia synthesis. Electrochemical catalytic is a major method of hydrogen production. However, precious metal materials represented by platinum-based metals are expensive and have a small amount of resource storage, which limits the development of electrocatalytic hydrogen production.

Molybdenum disulfide and tungsten disulfide have good electrocatalytic hydrogen evolution activity, low cost, excellent lithium storage performance, can be used as a negative electrode in lithium ion batteries, and have high specific capacity and high rate of discharge performance. Therefore, the development of molybdenum disulfide or tungsten disulfide electrode materials with high catalytic hydrogen evolution activity and lithium storage performance can not only effectively reduce energy consumption, but also improve the specific capacity and rate performance of lithium ion batteries.

In order to improve the electrocatalytic hydrogen evolution activity and lithium storage performance of molybdenum disulfide or tungsten disulfide materials, a method for preparing a two-dimensional material of molybdenum disulfide and tungsten disulfide nanoflake electrode materials has been proposed, which can efficiently catalyze electrolysis hydrogen production and reduce Energy consumption, and has good lithium storage performance and rate performance, including:

By mixing a certain proportion of Ni, Cu, Fe, Co, Ag metal with molybdenum disulfide or tungsten disulfide powder, dry pressing molding, sintering in a protective gas atmosphere at a temperature of 600-1400 ° C. The sintered metal-molybdenum disulfide or tungsten disulfide composite is used as the anode, the metal platinum or graphite is used as the cathode, and the aqueous sulfate solution is used as the electrolyte. The molybdenum disulfide or the disulfide is electrochemically stripped at a DC voltage of 0.2-30 V. Tungsten, the temperature is controlled at 1-90oC, and the pole spacing between the electrodes is controlled between 0.1-5cm. After the electrochemical stripping is completed, the electrolyte is subjected to suction filtration, and the filtered solid component is treated with nitric acid multiple times. Centrifugal separation until the solution is neutral. The solid material obtained by centrifugation contains a large amount of two-dimensional material of molybdenum disulfide or tungsten disulfide, and then the solid obtained by centrifugation is dissolved in isopropanol or nitrogen-nitroformamide solution. Among them, centrifugation at 500-4000 rpm for 1-30 minutes, taking the upper centrifugation solution, and then centrifuging the upper centrifugation solution again at 8000-10000 rpm, the obtained solid material is two. Dimensional material molybdenum disulfide or tungsten disulfide.

The two-dimensional form of molybdenum disulfide or tungsten disulfide prepared by the electrochemical stripping method can be used to peel the molybdenum disulfide or tungsten disulfide bulk material into a two-dimensional material by using a sulfate solution under normal temperature and normal temperature and mild conditions. As a hydrogen evolution electrode, it can effectively reduce the potential of the cathode polarized electrode, effectively improve the efficiency of hydrogen production by electrolyzed water, and reduce energy consumption. The electrochemically stripped molybdenum disulfide or tungsten disulfide two-dimensional material is used as the anode material of the lithium ion battery, which can effectively improve the specific capacity and rate performance of the lithium ion battery.

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